Improvement in rotary pumps



N' UNITED SrAIEs sAMUED A. wEsT,-or sANEEANoIsoo, cALIEoENIA, AND LEwIseooDwIN,

0E vIEGINIA CITY, NEVADA. l

IMPROVEMENT IN Roi- ARV PuMPs.

Specification formingpart of Letters Patent No. SLSGL dated October 1,1872.

To allwhom it may concern:

Be it known thatwe, SAMUEL ALEXANDER WEST, of the city and county of SanFrancisco, State of California, and LEWIS GOODWIN,

of Virginia City,county of Storey and State of Nevada, have invented anImproved Rotary (lift and force) Pump and We do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanying drawing and to the lettersmarked thereon.

Our invention relates to certain improvements in pumps of that class inwhich an eccentrically-Inounted piston revolves upon its shaft within acylindrical case, and which are known asrotary pumps; and it consists,mainly, in a novel construction and arrangement of the "piston and itsconnection with the operating eccentric by means of conical or othershaped friction-rollers, either with or without centers, whereby all theworking parts are caused to r'un with the least possible friction, andall wear can be easily compensated. It

` Vfurther consists in the employment ofa rubber packing upon theoutside or inside cylinder, or both, and a rollingcontact of the parts,Vwhich gives smoothness and a close lit. A

sliding valve or diaphragm is iitted to move automatically with thepiston and separate the suction and discharge chambers, and this is alsoprovided with friction-rollers. The ends ofthe piston are channeled, andan adjustable packing-plate is set up by adjustingscrews, so that wateris employed to make the r parts as vtight as may be desired while inaction without creating unnecessary friction.

Referring. to the drawing ...for a more complete explanation of ourinvention, Figure l Ais a side elevation of the pump with the side ofthe case removed, showing the packingplate. Fig. 2 is a vertical sectionof the pump with the packing-plate removed. Fig. 3 isa perspective viewof one of the rollers. Fig. 4 is a transverse section taken through Fig.l.

Similar letters indicate like parts.

A is the caseof thepump, which is made preferably in the form of a shortcylinder of large proportional diameter, and provided at one side withsuction and discharge chambers B and C, suitable pipes leading fromeach. These chambers are separated by a partition,

which is made to suit. This eccentric is, in

the present case, made of ftwo frustums of cones keyed to the shaft, soas to stand a short distance apart and withtheir smaller ends 'tojwardeach other, but itis manifest that other devices might be made toanswer. The piston proper I consists of a cylinder made somewhat smallerthan the interior of tlie case, and its outer surface is covered with arubber pack- The interior is made conical, as shown,

ing, J and between this piston 'and the eccentric H is placed a numberof rollers, K. rollers are made, in the present instance, in the form ofdouble cones or frustum's, the bases lying together, so that when inplace they just fit the groovesy made by'the peculiar shapes of the-eccentric. and the piston, as before described. rlhe two parts of theeccentric H are so itted that they can be moved nearer together on thekey or feather by nuts r, and by this means, with the conical rollersdescribed above, any wear of the parts can ,be easily compensated. Awasher, S5 is placed between the nuts and the sides ofthe eccentric togive elasticity and relieve the strain. The outer edges of the pistonare channeled, as shown at L, for a purpose to be hereafter described.The partition D is slotted, as shown, and a movable sliding diaphragm,M, fits into this slot, being as wide'as the piston. This diaphragm ismade hollow below, as shown', to relieve the frictionfofthe movingparts.' Arms extend upon each side of this diaphragm, and at their endscarry rollers N, which fit into the channels L, and as the piston iscarried around by the movements of the eccentric the diaphragm is movedout and in, thus always keeping the divisions complete between the inletand discharge chambers. A

friction-roller, O, also moves at the edge of the diaphragm and againstthe facerot' the piston to insure freedom of action. At` the ends of thepiston are plates P, which are adjusted by set-screws Q from theoutside, and

are by this means brought as close to the ends of the piston as may benecessary, and when the pump is running the water contained in These thechannels L serves as a packing, which is of superior tightness, with theleast possible friction.

The operation of our pump will be as follows: The pump being driven bythe proper power applied to the shaft Gr, by means of a pulley orotherwise, the shaft and the eccen- 'tric II will be rapidly rotated.This eccentric movement will be communicated to the piston I by means ofthe rollers K, so that the piston will move around the interior of thepumpcase with a rolling contact, thus driving the water from thesuction-chamber around to the discharge-chamber, from which it passes bymeans of a pipe. v

By this construction we are enabled to greatly reduce the friction andto render thev pump perfectly tight with the least possible Wear on theparts.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is

1. The piston I, in combination with the rollers K and the adjustableeccentric H, substantially` as and for the purpose described.

2. The rollers K, when constructed in the form of a double cone,together with the beveled eccentric H and the beveled interior of thepiston, for the purpose of retaining the latter in its central positionin the case at all times, substantially as herein described.

3., The piston I, operated as herein shown, and provided with theelastic face J, for the purpose of giving a perfect rolling contact atall times, substantially as described.

4. The side plates l?, with their adjustingscrews Q, in combination withthe piston I, substantially as and for the purpose described.

5. In combination with the adjustable packing-plates P, we claim thepiston I, when channeled or chamber-ed at L for the purpose of

